Check several things if these pool cleaners stop moving. Check the filter screen in the in-line filter and clean, if necessary. Clean the skimmer basket, pump basket, and pool filter. Check all of the hoses,connections, and swivels for leaks that could cause loss of water pressure. Make sure that your wheel RPM is between 28 and 32. Adjust your thrust if necessary to get RPM to that level.

Be sure and remove the top cover and check that the drive gear feed lines (water lines) have not come loose. I had one come loose and the sweep barely moved at all. Put in back on and the sweep ran like new.

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Check the pool cleaners filter screen in the in-line filter and clean, if necessary.Clean the skimmer basket, pump basket, and pool filter. If one of these is full or clogged, it could be weighing part of the cleaner down. Check all of the hoses, connections, and swivels for leaks that could cause loss ofwater pressure. Finally, make sure that your wheel RPM is set correctly (between 28-30 RPM)

Also check the skimmer basket and pump. Make sure they are functioning properly. Check all hoses, connections, and swivels for leaks that could be causing a lack of water pressure in these pool cleaners. Make sure that your wheel RPM is between 28 and 32. Increase the pressure to create more RPM.

should be a return outlet half way in pool closest to pump install fitting into wall connect Polaris and turn on filter pump and booster pump should move around pool adjust screw on back bottom for tail

Here are some things to check:
1. There are belts inside the unit that drive the wheels. These belts often fail (shred) and must be replaced.
2. There is a paddlewheel that drives the turbine that turns the wheels. If the jet that drives the turbine is clogged, then the paddlewheel will not move and the wheels will not turn.
3. There is a water management system inside the bottom of the unit. It looks like a bunch of little hoses. If one of these hoses comes loose, then the water pressure will escape inside the unit and will not be sufficient to drive the wheels.
Hope this helps